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                <h4 id="Vue3-setup"><a href="#Vue3-setup" class="headerlink" title="Vue3-setup"></a>Vue3-setup</h4><ul>
<li><p>Vue3.0 中 setup 是一个新的配置项, 值为一个函数; </p>
</li>
<li><p>setup 是所有<font color='red'>Composition API(组合 API) </font>的表演舞台</p>
</li>
<li><p>组件中用到的数据, 方法等都是配置再 setup 中</p>
</li>
<li><p>setup 函数返回两种值</p>
<ul>
<li>若返回一个对象, 则对象中的属性, 方法, 在模板中均可使用</li>
<li>若返回一个渲染函数，则可以自定义渲染函数</li>
</ul>
</li>
</ul>
<h4 id="注意点"><a href="#注意点" class="headerlink" title="注意点"></a>注意点</h4><ul>
<li>尽量不要与 Vue2.x 配置混合使用</li>
<li>Vue2.x 配置(data methods computed……)中可以访问到 setup 中的属性和方法</li>
<li>但是在 setup 中不能访问到 Vue2.x 配置的(data computed methods……)</li>
<li>如果有重名, setup 优先</li>
<li>setupU 不能是一个 async 函数, 因为返回值不再是一个 return 的对象, 而是 promise 对象，模板中看不到 return 对象的属性</li>
</ul>
<pre class=" language-javaScript"><code class="language-javaScript">export dafault &#123;
    name: "App",
    setup() &#123;
        let name = "张三";
        let age = 18;

        function seyHello() &#123;
            console.log("你好,我是中国人")
        &#125;
        // 返回一个函数
        return &#123;
            name,
            age,
            seyHello,
        &#125;
    &#125;
&#125;</code></pre>
<h4 id="setup-2022-06-23复习"><a href="#setup-2022-06-23复习" class="headerlink" title="setup 2022.06.23复习"></a>setup 2022.06.23复习</h4><ol>
<li>setup是组合式API的入口;接收两个参数props和context;props和vue2中的props是一致的;</li>
<li>props不能用ES6的解构,否则props中的数据会丧失响应式;如果需要解构 prop，可以在 setup 函数中使用 toRefs 函数来完成此操作</li>
<li>如果需要解构 prop，可以在 setup 函数中使用 toRefs 函数来完成此操作</li>
<li>setup在beforCreate之前执行，此时this为undefined<pre class=" language-javaScript"><code class="language-javaScript">// src/components/UserRepositories.vue `setup` function
import &#123; fetchUserRepositories &#125; from '@/api/repositories'
</code></pre>
</li>
</ol>
<p>// 在我们的组件内<br>setup (props) {<br>  let repositories = []<br>  const getUserRepositories = async () =&gt; {<br>    repositories = await fetchUserRepositories(props.user)<br>  }</p>
<p>  return {<br>    repositories,<br>    getUserRepositories // 返回的函数，它的行为与将其定义在 methods 选项中的行为相同<br>  }<br>}</p>
<pre><code>context参数
```javaScript
// MyBook.vue

export default &#123;
  setup(props, context) &#123;
    // Attribute (非响应式对象，等同于 $attrs)
    console.log(context.attrs)

    // 插槽 (非响应式对象，等同于 $slots)
    console.log(context.slots)

    // 触发事件 (方法，等同于 $emit)
    console.log(context.emit)

    // 暴露公共 property (函数)
    console.log(context.expose)
  &#125;
&#125;</code></pre>
<h4 id="setupe语法糖"><a href="#setupe语法糖" class="headerlink" title="setupe语法糖"></a>setupe语法糖</h4><pre class=" language-javaScript"><code class="language-javaScript"><script setup>
    //这里跟setup函数一样的写法,只是不需要return,组件不需要挂在compones上,可以直接在模板上使用
    import &#123; reactive, ref &#125; from '@vue/reactivity'
    import &#123; computed, watch, watchEffect &#125; from '@vue/runtime-core'
    import &#123; getCurrentInstance &#125; from 'vue'
    const &#123; proxy &#125; = getCurrentInstance()
    import HelloWorld from './components/HelloWorld.vue'
    import headerModule from './components/js/headerModule'
    const data = (&#123;

    &#125;)
</script>
</code></pre>
<p>seyup的props参数和context参数直接用defineProps和defineEmits代替</p>
<pre class=" language-javaScript"><code class="language-javaScript"><script setup>
const props = defineProps(&#123;
  foo: String
&#125;)

const emit = defineEmits(['change', 'delete'])
// setup code
</script>
</code></pre>
<h4 id="Ref-属性-申明响应式数据"><a href="#Ref-属性-申明响应式数据" class="headerlink" title="Ref 属性: 申明响应式数据"></a>Ref 属性: 申明响应式数据</h4><p>作用: 定义一个响应式的数据<br>当申明变量的时候, 用 Ref 进行包裹, 申明出来的变量就是响应式的数据, 并且打印出来的变量就是一个 RefImpl 对象; 所以当我们获取值的时候, 需要用 RefImpl 对象.value 才能取到值</p>
<h5 id="Ref-的原理就是利用了-Object-defineProperty-的-get-和-set-对值的拦截处理-当需要获取值的时候-就用-get-去获取值-当需要给更新值的时候-调用-set-对值进行更新"><a href="#Ref-的原理就是利用了-Object-defineProperty-的-get-和-set-对值的拦截处理-当需要获取值的时候-就用-get-去获取值-当需要给更新值的时候-调用-set-对值进行更新" class="headerlink" title="Ref 的原理就是利用了 Object.defineProperty 的 get 和 set 对值的拦截处理; 当需要获取值的时候, 就用 get 去获取值; 当需要给更新值的时候, 调用 set 对值进行更新;"></a>Ref 的原理就是利用了 Object.defineProperty 的 get 和 set 对值的拦截处理; 当需要获取值的时候, 就用 get 去获取值; 当需要给更新值的时候, 调用 set 对值进行更新;</h5><ul>
<li>Ref 只能接受基本数据类型; </li>
<li>当接受的数据类型为对象类型数据时, 内部会求助 Reactive 函数; </li>
</ul>
<p><img src="https://i.loli.net/2021/11/29/6gGih4VYuRB2cxt.png" alt="Ref对象.png"></p>
<pre class=" language-javaScript"><code class="language-javaScript">import &#123;
    Ref
&#125; from "Vue";
export dafault &#123;
    name: "App",
    setup() &#123;
        let name = Ref("张三");
        let age = Ref(18);
        console.log(name.value);
        console.log(age.value);

        function seyHello() &#123;
            console.log("你好,我是中国人")
        &#125;
        // 返回一个函数
        return &#123;
            name,
            age,
            seyHello,
        &#125;
    &#125;
&#125;</code></pre>
<h4 id="Reactive-函数"><a href="#Reactive-函数" class="headerlink" title="Reactive 函数"></a>Reactive 函数</h4><p>作用: 定义一个对象类型的响应式数据(基本类型数据别用他, 用 Ref 函数)<br>语法:const 代理对象 = reactive(被代理对象), 接受一个对象或者数组; 返回一个<font color='red'>代理器对象(Proxy 对象)</font></p>
<ul>
<li>reactive 函数定义的响应式数据是深层次的; </li>
<li>内部是基于 ES6de Proxy 实现; </li>
</ul>
<h4 id="Vue3-的响应式原理"><a href="#Vue3-的响应式原理" class="headerlink" title="Vue3 的响应式原理"></a>Vue3 的响应式原理</h4><p>响应式原理: 当你对一个数据对象进行增删改查的时候, 都能捕获到你的操作; 那么这就是响应式数据的原理</p>
<p>ES6 的 Proxy 可以理解成, 在目标对象之前架设一层“拦截”, 外界对该对象的访问, 都必须通过这层拦截; 因此提供了一种机制, 可以对外界的访问进行过滤和改写;<br>可以译做“代理器”; </p>
<pre class=" language-javaScript"><code class="language-javaScript">var obj = new Proxy(&#123;&#125;, &#123;
    get: function(target, propKey, receiver) &#123;
        console.log(`getting $&#123;propKey&#125;!`);
        return Reflect.get(target, propKey, receiver);
    &#125;,
    set: function(target, propKey, value, receiver) &#123;
        console.log(`setting $&#123;propKey&#125;!`);
        return Reflect.set(target, propKey, value, receiver);
    &#125;
&#125;);</code></pre>
<pre class=" language-javaScript"><code class="language-javaScript">let person = &#123;
    name: "张三",
    age: 18,
&#125;;
const p = new Proxy(person, &#123;
    // 当有人读取p的某个属性时调用
    get(target, propName) &#123;
        console.log(`有人读取了P身上的&&#123;propName&#125;属性`);
        return Reflect.get(target, propName);
    &#125;,
    // 当有人修改p的某个属性或者新增某个属性时调用
    set(target, propName, value) &#123;
        console.log(`有人修改了P身上的&&#123;propName&#125;属性,我要去进行界面更新了`);
        // target[propName] = value;
        Reflect.set(target, propName, value)
    &#125;,
    // 当有人删除P的某个属性时调用
    deleteProperty(target, propName) &#123;
        console.log(`有人删除了P身上的&&#123;propName&#125;属性,我要去进行界面更新了`);
        return Reflect.deleteProperty(target, propName);
    &#125;
&#125;);</code></pre>
<h5 id="Vue3响应式数据原理总结"><a href="#Vue3响应式数据原理总结" class="headerlink" title="Vue3响应式数据原理总结"></a>Vue3响应式数据原理总结</h5><ul>
<li>通过Proxy(代理): 拦截对象中任意属性的变化, 包括: 属性值的读写, 属性的添加, 属性的删除等; </li>
<li>通过Reflect(反射): 对被代理对象的属性进行操作; </li>
</ul>
<h4 id="为什么用Reflect而不用Object呢"><a href="#为什么用Reflect而不用Object呢" class="headerlink" title="为什么用Reflect而不用Object呢"></a>为什么用Reflect而不用Object呢</h4><pre class=" language-javaScript"><code class="language-javaScript">let person = &#123;
    name: "张三",
    age: 18,
&#125;;
Obejct.defineProperty(person, age, &#123;
    get() &#123;
        return 123;
    &#125;
&#125;);
Obejct.defineProperty(person, age, &#123;
    get() &#123;
        return 234;
    &#125;
&#125;);</code></pre>
<p>当我们给person对象的age属性重复设置一个get拦截的时候, 会报错; </p>
<p><img src="https://i.loli.net/2021/11/30/iRNqKZ8r7azfCGd.png" alt="Object.defineProperty报错.png"></p>
<p>相反, 当我们用Reflect去重复定义一个的时候, 虽然重复的设置的值无效, 但是代码不会报错; 代码健壮性更强; 所以如果用Object.definePropeerty, 我们需要用try catch去捕捉报错; </p>
<pre class=" language-javaScript"><code class="language-javaScript">let person = &#123;
    name: "张三",
    age: 18,
&#125;;
let x1 = Reflect.defineProperty(person, age, &#123;
    get() &#123;
        return 123;
    &#125;
&#125;);

let x2 = Reflect.defineProperty(person, age, &#123;
    get() &#123;
        return 234;
    &#125;
&#125;);
if (x1) &#123;
    console.log("XXX操作成功了！")
&#125; else &#123;
    console.log("XXX操作失败了！")
&#125;

// Reflect会返回执行的结果;
try () &#123;
    Obejct.defineProperty(person, age, &#123;
        get() &#123;
            return 123;
        &#125;
    &#125;);
&#125; catch (error => &#123;
    console.log(error)
&#125;);
try () &#123;
    Obejct.defineProperty(person, age, &#123;
        get() &#123;
            return 234;
        &#125;
    &#125;);
&#125; catch (error => &#123;
    console.log(error)
&#125;);</code></pre>
<p>对于vue3而言，底层使用reflect会比较健壮，不容易出现有个错误就导致程序阻塞, 如果使用reflect，当出现错误的时候，进行逻辑判断从而代码继续往下走</p>
<h4 id="拓展–vscode-注释收缩"><a href="#拓展–vscode-注释收缩" class="headerlink" title="拓展–vscode 注释收缩"></a>拓展–vscode 注释收缩</h4><p>注释开头 // #region<br>注释结尾 // #endregion</p>

                
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